663 lines
16 KiB
C
663 lines
16 KiB
C
static char sccsid[] = "@(#)91 1.15.1.11 src/bos/kernel/net/route.c, sysnet, bos411, 9428A410j 5/16/94 16:03:35";
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/*
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* COMPONENT_NAME: SYSNET
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*
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* FUNCTIONS: SA
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* ifa_ifwithroute
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* rt_maskedcopy
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* rtalloc
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* rtalloc1
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* rtfree
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* rtinit
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* rtinithead
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* rtioctl
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* rtredirect
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* rtrequest
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*
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*
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* ORIGINS: 26,27,85
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*
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*
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* (C) COPYRIGHT International Business Machines Corp. 1988,1993
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* All Rights Reserved
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* Licensed Materials - Property of IBM
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* US Government Users Restricted Rights - Use, duplication or
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* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
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*/
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/*
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* (c) Copyright 1990, 1991, 1992, 1993 OPEN SOFTWARE FOUNDATION, INC.
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* ALL RIGHTS RESERVED
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*/
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/*
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* OSF/1 1.2
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*/
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/*
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* Copyright (C) 1988,1989 Encore Computer Corporation. All Rights Reserved
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*
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* Property of Encore Computer Corporation.
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* This software is made available solely pursuant to the terms of
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* a software license agreement which governs its use. Unauthorized
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* duplication, distribution or sale are strictly prohibited.
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*
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*/
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/*
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* Copyright (c) 1980, 1986 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted provided
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* that: (1) source distributions retain this entire copyright notice and
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* comment, and (2) distributions including binaries display the following
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* acknowledgement: ``This product includes software developed by the
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* University of California, Berkeley and its contributors'' in the
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* documentation or other materials provided with the distribution and in
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* all advertising materials mentioning features or use of this software.
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* Neither the name of the University nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Base: route.c 7.12 (Berkeley) 5/4/89
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* Merged: route.c 7.17 (Berkeley) 6/28/90
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* Merged: route.c 7.22 (Berkeley) 6/27/91
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*/
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#include "net/net_globals.h"
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#include "sys/param.h"
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#include "sys/time.h"
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#include "sys/errno.h"
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#include "sys/ioctl.h"
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#include "sys/mbuf.h"
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#include "sys/socket.h"
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#include "sys/socketvar.h"
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#include "sys/domain.h"
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#include "sys/protosw.h"
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#include "net/if.h"
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#include "net/route.h"
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#include "net/raw_cb.h"
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#include "net/net_malloc.h"
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#ifdef _AIX
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#define min MIN
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#endif /* _AIX */
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LOCK_ASSERTL_DECL
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#define SA(p) ((struct sockaddr *)(p))
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int rttrash; /* routes not in table but not freed */
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struct radix_node_head *rnheads[AF_MAX];
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static void (*setroutemask[AF_MAX])(struct sockaddr *, struct sockaddr *);
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struct route_cb route_cb;
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struct rtstat rtstat;
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#if NETSYNC_LOCK
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simple_lock_data_t route_lock;
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#endif
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void
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rtinithead(family, count, fcn)
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void (*fcn)(struct sockaddr *, struct sockaddr *);
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{
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register struct radix_node_head *rnh;
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ROUTE_LOCK_DECL()
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if ((unsigned)family >= AF_MAX)
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panic("rtinithead");
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ROUTE_WRITE_LOCK();
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for (rnh = radix_node_head; rnh && (family != rnh->rnh_af); )
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rnh = rnh->rnh_next;
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if (rnh == 0) {
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rn_inithead(&rnheads[family], count, family);
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setroutemask[family] = fcn;
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}
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ROUTE_WRITE_UNLOCK();
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}
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/*
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* Packet routing routines.
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*/
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void
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rtalloc(ro)
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register struct route *ro;
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{
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ROUTE_LOCK_DECL()
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ROUTE_WRITE_LOCK();
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rtalloc_nolock(ro);
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ROUTE_WRITE_UNLOCK();
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}
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void
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rtalloc_nolock(ro)
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register struct route *ro;
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{
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LOCK_ASSERT("rtalloc_nolock", ROUTE_ISLOCKED());
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if (ro->ro_rt && ro->ro_rt->rt_ifp && (ro->ro_rt->rt_flags & RTF_UP))
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return; /* XXX */
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ro->ro_rt = rtalloc1_nolock(&ro->ro_dst, 1);
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}
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struct rtentry *
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rtalloc1(dst, report)
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register struct sockaddr *dst;
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int report;
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{
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struct rtentry *newrt = 0;
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ROUTE_LOCK_DECL()
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ROUTE_WRITE_LOCK();
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newrt = rtalloc1_nolock(dst, report);
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ROUTE_WRITE_UNLOCK();
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return (newrt);
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}
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struct rtentry *
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rtalloc1_nolock(dst, report)
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register struct sockaddr *dst;
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int report;
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{
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register struct radix_node_head *rnh;
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register struct rtentry *rt;
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register struct radix_node *rn;
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struct rtentry *newrt = 0;
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int err = 0, msgtype = RTM_MISS;
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NETSTAT_LOCK_DECL()
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LOCK_ASSERT("rtalloc1_nolock", ROUTE_ISLOCKED());
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for (rnh = radix_node_head; rnh && (dst->sa_family != rnh->rnh_af); )
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rnh = rnh->rnh_next;
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if (rnh && rnh->rnh_treetop &&
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(rn = rn_match((caddr_t)dst, rnh->rnh_treetop)) &&
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((rn->rn_flags & RNF_ROOT) == 0)) {
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newrt = rt = (struct rtentry *)rn;
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if (report && (rt->rt_flags & RTF_CLONING)) {
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if ((err = rtrequest_nolock(RTM_RESOLVE, dst, SA(0),
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SA(0), 0, &newrt)) ||
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((rt->rt_flags & RTF_XRESOLVE)
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&& (msgtype = RTM_RESOLVE))) /* intended! */
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goto miss;
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#ifdef _AIX_FULLOSF
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if (err = rtrequest(RTM_RESOLVE, dst, SA(0),
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SA(0), 0, &newrt))
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goto miss;
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#endif /* _AIX_FULLOSF */
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} else
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rt->rt_refcnt++;
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} else {
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NETSTAT_LOCK(&rtstat.rts_lock);
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rtstat.rts_unreach++;
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NETSTAT_UNLOCK(&rtstat.rts_lock);
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miss: if (report)
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rt_missmsg(msgtype, dst, SA(0), SA(0), SA(0), 0, err);
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}
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return (newrt);
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}
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void
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rtfree(rt)
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register struct rtentry *rt;
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{
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ROUTE_LOCK_DECL()
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ROUTE_WRITE_LOCK();
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rtfree_nolock(rt);
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ROUTE_WRITE_UNLOCK();
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}
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void
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rtfree_nolock(rt)
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register struct rtentry *rt;
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{
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IFAREFCNT_LOCK_DECL()
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LOCK_ASSERT("rtfree_nolock", ROUTE_ISLOCKED());
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if (rt == 0)
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panic("rtfree");
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rt->rt_refcnt--;
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if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_UP) == 0) {
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rttrash--;
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if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT))
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panic ("rtfree 2");
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IFAREFCNT_LOCK()
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IFAFREE(rt->rt_ifa);
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IFAREFCNT_UNLOCK()
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NET_FREE(rt, M_RTABLE);
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}
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}
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void
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ifafree(ifa)
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register struct ifaddr *ifa;
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{
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if (ifa == NULL)
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panic("ifafree");
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if (ifa->ifa_refcnt == 0)
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NET_FREE(ifa, M_IFADDR);
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else
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ifa->ifa_refcnt--;
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}
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/*
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* Force a routing table entry to the specified
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* destination to go through the given gateway.
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* Normally called as a result of a routing redirect
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* message from the network layer.
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*/
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void
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rtredirect(dst, gateway, netmask, flags, src, rtp)
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struct sockaddr *dst, *gateway, *netmask, *src;
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int flags;
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struct rtentry **rtp;
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{
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register struct rtentry *rt = 0;
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int error = 0;
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short *stat = 0;
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struct ifaddr *ifa;
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ROUTE_LOCK_DECL()
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NETSTAT_LOCK_DECL()
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ROUTE_WRITE_LOCK();
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/* verify the gateway is directly reachable */
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ifa = ifa_ifwithnet(gateway);
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if (ifa == 0) {
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error = ENETUNREACH;
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goto done;
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}
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rt = rtalloc1_nolock(dst, 0);
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/*
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* If the redirect isn't from our current router for this dst,
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* it's either old or wrong. If it redirects us to ourselves,
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* we have a routing loop, perhaps as a result of an interface
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* going down recently.
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* 10/12/93: skip "confirm redirect is from current router"
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* if using own interface as gateway (for proxy ARP).
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*/
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#define equal(a1, a2) (bcmp((caddr_t)(a1), (caddr_t)(a2), (a1)->sa_len) == 0)
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if (!(flags & RTF_DONE) && rt &&
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((!equal(rt->rt_gateway, rt->rt_ifa->ifa_addr) &&
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!equal(src, rt->rt_gateway)) || rt->rt_ifa != ifa))
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error = EINVAL;
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else if (ifa_ifwithaddr(gateway))
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error = EHOSTUNREACH;
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if (error)
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goto done;
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/*
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* Create a new entry if we just got back a wildcard entry
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* or the the lookup failed. This is necessary for hosts
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* which use routing redirects generated by smart gateways
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* to dynamically build the routing tables.
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*/
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if ((rt == 0) || (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
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goto create;
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/*
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* Don't listen to the redirect if it's
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* for a route to an interface.
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*/
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if (rt->rt_flags & RTF_GATEWAY) {
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if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) {
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/*
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* Changing from route to net => route to host.
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* Create new route, rather than smashing route to net.
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*/
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create:
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flags |= RTF_GATEWAY | RTF_DYNAMIC;
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error = rtrequest_nolock((int)RTM_ADD, dst, gateway,
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#ifdef _AIX
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netmask, flags, (struct rtentry **)0);
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#else /* _AIX */
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SA(0), flags, (struct rtentry **)0);
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#endif /* _AIX */
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stat = &rtstat.rts_dynamic;
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} else {
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/*
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* Smash the current notion of the gateway to
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* this destination. Should check about netmask!!!
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*/
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if (gateway->sa_len <= rt->rt_gateway->sa_len) {
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Bcopy(gateway, rt->rt_gateway, gateway->sa_len);
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rt->rt_flags |= RTF_MODIFIED;
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flags |= RTF_MODIFIED;
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stat = &rtstat.rts_newgateway;
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} else
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error = ENOSPC;
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}
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} else
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error = EHOSTUNREACH;
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done:
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if (rt) {
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if (rtp && !error)
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*rtp = rt;
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else
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rtfree_nolock(rt);
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}
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ROUTE_WRITE_UNLOCK();
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NETSTAT_LOCK(&rtstat.rts_lock);
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if (error)
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rtstat.rts_badredirect++;
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else
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(stat && (*stat)++);
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NETSTAT_UNLOCK(&rtstat.rts_lock);
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rt_missmsg(RTM_REDIRECT, dst, gateway, netmask, src, flags, error);
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}
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/*
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* Routing table ioctl interface.
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*/
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rtioctl(so, req, data)
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struct socket *so;
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int req;
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caddr_t data;
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{
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#ifndef COMPAT_43
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return (EOPNOTSUPP);
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#else
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register struct ortentry *entry = (struct ortentry *)data;
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int error;
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struct sockaddr *netmask = 0, protomask;
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if (req == SIOCADDRT)
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req = RTM_ADD;
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else if (req == SIOCDELRT)
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req = RTM_DELETE;
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else
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return (EINVAL);
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LOCK_ASSERT("rtioctl", SOCKET_ISLOCKED(so));
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if (!(so->so_state & SS_PRIV))
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return (EACCES);
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#if BYTE_ORDER != BIG_ENDIAN
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if (entry->rt_dst.sa_family == 0 && entry->rt_dst.sa_len < 16) {
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entry->rt_dst.sa_family = entry->rt_dst.sa_len;
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entry->rt_dst.sa_len = 16;
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}
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if (entry->rt_gateway.sa_family == 0 && entry->rt_gateway.sa_len < 16) {
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entry->rt_gateway.sa_family = entry->rt_gateway.sa_len;
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entry->rt_gateway.sa_len = 16;
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}
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#else
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if (entry->rt_dst.sa_len == 0)
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entry->rt_dst.sa_len = 16;
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if (entry->rt_gateway.sa_len == 0)
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entry->rt_gateway.sa_len = 16;
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#endif
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if ((entry->rt_flags & RTF_HOST) == 0 &&
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(unsigned)(entry->rt_dst.sa_family) < AF_MAX &&
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setroutemask[entry->rt_dst.sa_family]) {
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bzero((caddr_t)&protomask, sizeof protomask);
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(*setroutemask[entry->rt_dst.sa_family])
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(&entry->rt_dst, &protomask);
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netmask = &protomask;
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}
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error = rtrequest(req, &(entry->rt_dst), &(entry->rt_gateway), netmask,
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entry->rt_flags, (struct rtentry **)0);
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rt_missmsg((req == RTM_ADD ? RTM_OLDADD : RTM_OLDDEL),
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&(entry->rt_dst), &(entry->rt_gateway),
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netmask, SA(0), entry->rt_flags, error);
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return (error);
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#endif
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}
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struct ifaddr *
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ifa_ifwithroute(flags, dst, gateway)
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int flags;
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struct sockaddr *dst, *gateway;
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{
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register struct ifaddr *ifa;
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if ((flags & RTF_GATEWAY) == 0) {
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/*
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* If we are adding a route to an interface,
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* and the interface is a pt to pt link
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* we should search for the destination
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* as our clue to the interface. Otherwise
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* we can use the local address.
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*/
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ifa = 0;
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if (flags & RTF_HOST)
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ifa = ifa_ifwithdstaddr(dst);
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if (ifa == 0)
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ifa = ifa_ifwithaddr(gateway);
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} else {
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/*
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* If we are adding a route to a remote net
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* or host, the gateway may still be on the
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* other end of a pt to pt link.
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*/
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ifa = ifa_ifwithdstaddr(gateway);
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}
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if (ifa == 0)
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ifa = ifa_ifwithnet(gateway);
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if (ifa == 0) {
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struct rtentry *rt = rtalloc1_nolock(dst, 0);
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if (rt == 0)
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return (0);
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rt->rt_refcnt--;
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if ((ifa = rt->rt_ifa) == 0)
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return (0);
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}
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if (ifa->ifa_addr->sa_family != dst->sa_family) {
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struct ifaddr *oifa = ifa;
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ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
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if (ifa == 0)
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ifa = oifa;
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}
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return (ifa);
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}
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rtrequest(req, dst, gateway, netmask, flags, ret_nrt)
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int req, flags;
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struct sockaddr *dst, *gateway, *netmask;
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struct rtentry **ret_nrt;
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{
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int error = 0;
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ROUTE_LOCK_DECL()
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ROUTE_WRITE_LOCK();
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error = rtrequest_nolock(req, dst, gateway, netmask, flags, ret_nrt);
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ROUTE_WRITE_UNLOCK();
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return (error);
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}
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rtrequest_nolock(req, dst, gateway, netmask, flags, ret_nrt)
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int req, flags;
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struct sockaddr *dst, *gateway, *netmask;
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struct rtentry **ret_nrt;
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{
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int len, error = 0;
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register struct rtentry *rt;
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register struct radix_node *rn;
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register struct radix_node_head *rnh;
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struct ifaddr *ifa;
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struct sockaddr *ndst;
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u_char af = dst->sa_family;
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#ifdef _AIX
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struct timestruc_t route_age;
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#endif /* _AIX */
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#undef senderr
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#define senderr(x) { error = (x); goto bad; }
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IFAREFCNT_LOCK_DECL()
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LOCK_ASSERT("rtrequest_nolock", ROUTE_ISLOCKED());
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for (rnh = radix_node_head; rnh && (af != rnh->rnh_af); )
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rnh = rnh->rnh_next;
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if (rnh == 0)
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senderr(ESRCH);
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if (flags & RTF_HOST)
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netmask = 0;
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switch (req) {
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case RTM_DELETE:
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if (ret_nrt && (rt = *ret_nrt)) {
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rtfree_nolock(rt);
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*ret_nrt = 0;
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}
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if ((rn = rn_delete((caddr_t)dst, (caddr_t)netmask,
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rnh->rnh_treetop)) == 0)
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senderr(ESRCH);
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if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
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panic ("rtrequest delete");
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rt = (struct rtentry *)rn;
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rt->rt_flags &= ~RTF_UP;
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if ((ifa = rt->rt_ifa) && ifa->ifa_rtrequest)
|
|
ifa->ifa_rtrequest(RTM_DELETE, rt, SA(0));
|
|
rttrash++;
|
|
if (rt->rt_refcnt <= 0)
|
|
rtfree_nolock(rt);
|
|
break;
|
|
|
|
case RTM_RESOLVE:
|
|
if (ret_nrt == 0 || (rt = *ret_nrt) == 0)
|
|
senderr(EINVAL);
|
|
ifa = rt->rt_ifa;
|
|
flags = rt->rt_flags & ~RTF_CLONING;
|
|
gateway = rt->rt_gateway;
|
|
if ((netmask = rt->rt_genmask) == 0)
|
|
flags |= RTF_HOST;
|
|
goto makeroute;
|
|
|
|
case RTM_ADD:
|
|
if ((ifa = ifa_ifwithroute(flags, dst, gateway)) == 0)
|
|
senderr(ENETUNREACH);
|
|
makeroute:
|
|
len = sizeof (*rt) + RT_ROUNDUP(gateway) + RT_ROUNDUP(dst);
|
|
R_Malloc(rt, struct rtentry *, len);
|
|
if (rt == 0)
|
|
senderr(ENOBUFS);
|
|
Bzero(rt, len);
|
|
ndst = (struct sockaddr *)(rt + 1);
|
|
if (netmask) {
|
|
rt_maskedcopy(dst, ndst, netmask);
|
|
} else
|
|
Bcopy(dst, ndst, dst->sa_len);
|
|
rn = rn_addroute((caddr_t)ndst, (caddr_t)netmask,
|
|
rnh->rnh_treetop, rt->rt_nodes);
|
|
if (rn == 0) {
|
|
NET_FREE(rt, M_RTABLE);
|
|
senderr(EEXIST);
|
|
}
|
|
IFAREFCNT_LOCK()
|
|
ifa->ifa_refcnt++;
|
|
IFAREFCNT_UNLOCK()
|
|
rt->rt_ifa = ifa;
|
|
rt->rt_ifp = ifa->ifa_ifp;
|
|
rt->rt_flags = RTF_UP | flags;
|
|
rt->rt_gateway = (struct sockaddr *)
|
|
(rn->rn_key + RT_ROUNDUP(dst));
|
|
#ifdef _AIX
|
|
/* SNMP BASE begin*/
|
|
/*
|
|
* ip_RouteAge is defined to be type int instead of
|
|
* type timeval in route.h because the reno compatibility.
|
|
*/
|
|
curtime (&route_age);
|
|
rt->ipRouteAge = (int) route_age.tv_sec;
|
|
/* SNMP BASE end*/
|
|
#endif /* _AIX */
|
|
Bcopy(gateway, rt->rt_gateway, gateway->sa_len);
|
|
if (req == RTM_RESOLVE)
|
|
rt->rt_rmx = (*ret_nrt)->rt_rmx; /* copy metrics */
|
|
if (ifa->ifa_rtrequest)
|
|
ifa->ifa_rtrequest(req, rt, SA(ret_nrt ? *ret_nrt : 0));
|
|
if (ret_nrt) {
|
|
*ret_nrt = rt;
|
|
rt->rt_refcnt++;
|
|
}
|
|
break;
|
|
}
|
|
bad:
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
rt_maskedcopy(src, dst, netmask)
|
|
struct sockaddr *src, *dst, *netmask;
|
|
{
|
|
register u_char *cp1 = (u_char *)src;
|
|
register u_char *cp2 = (u_char *)dst;
|
|
register u_char *cp3 = (u_char *)netmask;
|
|
u_char *cplim = cp2 + *cp3;
|
|
u_char *cplim2 = cp2 + *cp1;
|
|
|
|
#ifdef _AIX
|
|
/* Don't know why this is here, but afraid to remove it! */
|
|
if (!netmask) {
|
|
bcopy(cp1,cp2,sizeof(struct sockaddr));
|
|
return;
|
|
}
|
|
#endif /* _AIX */
|
|
*cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
|
|
cp3 += 2;
|
|
if (cplim > cplim2)
|
|
cplim = cplim2;
|
|
while (cp2 < cplim)
|
|
*cp2++ = *cp1++ & *cp3++;
|
|
if (cp2 < cplim2)
|
|
bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
|
|
}
|
|
/*
|
|
* Set up a routing table entry, normally
|
|
* for an interface.
|
|
*/
|
|
rtinit(ifa, cmd, flags)
|
|
register struct ifaddr *ifa;
|
|
int cmd, flags;
|
|
{
|
|
register struct rtentry *rt;
|
|
register struct sockaddr *dst;
|
|
register struct sockaddr *deldst;
|
|
struct mbuf *m = 0;
|
|
int error;
|
|
|
|
IFAREFCNT_LOCK_DECL()
|
|
|
|
dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr;
|
|
if (ifa->ifa_flags & IFA_ROUTE) {
|
|
if ((rt = ifa->ifa_rt) && (rt->rt_flags & RTF_UP) == 0) {
|
|
RTFREE(rt);
|
|
ifa->ifa_rt = 0;
|
|
}
|
|
}
|
|
if (cmd == RTM_DELETE) {
|
|
if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) {
|
|
m = m_get(M_WAIT, MT_SONAME);
|
|
deldst = mtod(m, struct sockaddr *);
|
|
rt_maskedcopy(dst, deldst, ifa->ifa_netmask);
|
|
dst = deldst;
|
|
}
|
|
if (rt = rtalloc1(dst, 0)) {
|
|
rt->rt_refcnt--;
|
|
if (rt->rt_ifa != ifa) {
|
|
if (m)
|
|
(void) m_free(m);
|
|
return (flags & RTF_HOST ? EHOSTUNREACH
|
|
: ENETUNREACH);
|
|
}
|
|
}
|
|
}
|
|
error = rtrequest(cmd, dst, ifa->ifa_addr, ifa->ifa_netmask,
|
|
flags | ifa->ifa_flags, &ifa->ifa_rt);
|
|
if (m)
|
|
(void) m_free(m);
|
|
if (cmd == RTM_ADD && error == 0 && (rt = ifa->ifa_rt)
|
|
&& rt->rt_ifa != ifa) {
|
|
IFAREFCNT_LOCK()
|
|
IFAFREE(rt->rt_ifa);
|
|
rt->rt_ifa = ifa;
|
|
rt->rt_ifp = ifa->ifa_ifp;
|
|
ifa->ifa_refcnt++;
|
|
IFAREFCNT_UNLOCK()
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#include "net/radix.c"
|